Cement compositions comprising aqueous latex containing dispersed solid and liquid elastomer phases

Patent metadata

Field	Value
Publication number	US-10947440-B2
Application number	US-201916372960-A
Country	US
Kind code	B2
Filing date	Apr 2, 2019
Priority date	Jan 12, 2018
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A composition for use as a latex cement additive, the composition comprising an aqueous latex, the aqueous latex comprising an aqueous fluid and a solid elastomer, where the solid elastomer is dispersed in the aqueous fluid; a liquid elastomer, the liquid elastomer having a viscosity between 50,000 cP and 300,000 cP at room temperature; and a surfactant, the surfactant operable to facilitate incorporation of the liquid elastomer into the aqueous latex.

First claim

That which is claimed is:

1. A method of using a cement slurry composition in a downhole application in a wellbore, the method comprising the steps of:
adding an amount of a liquid elastomer to an aqueous latex to produce a latex cement additive;
mixing the latex cement additive, such that the liquid elastomer forms a dispersed phase in the aqueous fluid;
adding an amount of the latex cement additive to a cement composition;
mixing the latex cement additive into the cement composition to form the cement slurry composition;
introducing the cement slurry composition to the wellbore in the downhole application; and
allowing the cement slurry composition to harden into a set cement.

2. The method of claim 1 , where the downhole application is selected from the group consisting of primary cementing operations, annulus sealing operations, and combinations of the same.

3. The method of claim 1 , where the aqueous latex comprises an aqueous fluid and a solid elastomer, where the solid elastomer is dispersed in the aqueous fluid.

4. The method of claim 3 , where the solid elastomer comprises monomers selected from butadiene monomers, styrene monomers, acrylonitrile monomers, ethylene monomers, vinyl acetate monomers, and combinations of the same.

5. The method of claim 1 , where the liquid elastomer has a viscosity between 50,000 cP and 300,000 cP at room temperature.

6. The method of claim 5 , where the liquid elastomer comprises a low molecular weight polymer having a molecular weight in the range of 1,000 Daltons (Da) to 250,000 Da, where the low molecular weight polymer comprises butadiene.

7. The method of claim 6 , where the low molecular weight polymer having a molecular weight in the range of 1,000 Da to 250,000 Da comprises polar groups selected from the group consisting of polar monomers, polar functional groups, and combinations of the same.

8. The method of claim 6 , where the low molecular weight polymer having a molecular weight in the range of 1,000 Da to 250,000 Da comprises polar monomers selected from the group consisting of acrylonitrile, maleic anhydride, vinyl acetate, and combinations of the same.

9. The method of claim 6 , where the low molecular weight polymer having a molecular weight in the range of 1,000 Da to 250,000 Da comprises the polar functional group selected from the group consisting of carboxylate groups, hydroxyl groups, carboxy anhydride groups, ester groups, sulfonate groups, phosphonate groups, and combinations of the same.

10. The method of claim 1 , where the cement composition comprises a cement and water.

11. The method of claim 10 , where the cement is selected from the group consisting of Portland cements, high alumina cements, magnesia cements, pozzolanic cements, and slag cements.

12. The method of claim 1 , where the latex cement additive further comprises a surfactant.

13. The method of claim 12 , where the surfactant is selected from the group consisting of anionic surfactants, non-ionic surfactants, and combinations of the same.

14. The method of claim 12 , where the surfactant is an anionic surfactant selected from the group consisting of sodium dodecylbenzene sulfonate, sodium lauryl sulfonate, a sulfate salt of a nonylphenol ethoxylate containing 20-40 moles of ethylene oxide.

15. The method of claim 12 , where the surfactant is a non-ionic surfactant, where the non-ionic surfactant is a nonylphenol ethoxylates containing 20-40 moles of ethylene oxide.

Assignees

• Saudi Arabian Oil Co

Inventors

• Reddy B Raghava

Classifications

• C04B40/0039

  Premixtures of ingredients · CPC title

• C04B28/04

  Portland cements · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C08L9/10

  Latex (C08L9/04, C08L9/08 take precedence) · CPC title